The B7 molecule levels differed markedly from those of HD (Figure 1A): PD-L1 (B7+ vs. B7–: p = 0.028, B7– vs. HD: p = 0.739), B7.2 (B7+ vs. B7–: p = 0.0003, B7– vs. HD: p = 0.7111) and ICOS-L (B7+ vs. B7–: p = 0.049, B7– vs. HD: p = 0.011). Here, ICOSLG is linked to Huntington disease.